CN114466501A - a relaxation method - Google Patents

Abstract

The present application belongs to the technical field of accelerator application and discloses a relaxation method. The method is to provide a negative pressure to the release film and extend the release film downward to a desired depth in the vertical direction to relax the release film. The release film is fixed on the target frame, and the surface of the release film is kept wet before relaxation. The release film of the relaxation method extends down to 1-3mm in the vertical direction, the relaxation success rate reaches more than 90%, and the life of the release film after relaxation is 3 times longer than that before relaxation.

Description

a relaxation method

technical field

The present application belongs to the technical field of accelerator applications, and in particular relates to a relaxation method.

Background technique

The use of a release film on a tandem accelerator can increase the energy of the extracted particle beam. The carbon peeling film or DLC peeling film currently used in the tandem accelerator has a short life, and the peeling film needs to be replaced frequently during the beam current provided by the accelerator. In nuclear physics experiments, it is sometimes necessary to extract a heavy ion beam with high current intensity and low energy on a tandem accelerator, which puts forward higher requirements on the life of the peeling film. Frequent replacement of the release film will directly shorten the repair cycle of the accelerator, reduce the operating efficiency of the accelerator, and increase the operating cost of the accelerator.

Therefore, there is an urgent need for a technical solution that can significantly improve the life of the accelerator stripping film.

SUMMARY OF THE INVENTION

(1) Technical purpose

According to the problems existing in the prior art, the present application provides a method for extending the release film downward in a vertical direction to relax the release film, and the life of the release film can be significantly improved by using this method.

(2) Technical solutions

In order to solve the problems existing in the prior art, the present application is achieved through the following technical solutions:

A relaxation method, which is to relax the release film by supplying a negative pressure to the release film and extending the release film downward to a desired depth in a vertical direction.

Preferably, the release film is fixed on the target frame, and the surface of the release film has a certain humidity before relaxation.

Preferably, the downward relaxation depth of the release film is 1˜3 mm.

Preferably, during the relaxation process of the release film, the release film is baked while being relaxed, so as to improve the relaxation speed and efficiency.

Preferably, the relaxation method is implemented using a relaxation device, wherein the relaxation device comprises:

The relaxation chamber is used to support the release film; the relaxation chamber is provided with a first through hole penetrating in the vertical direction, and the space where the first through hole is located is an air storage chamber; the release film to be relaxed is placed on the upper end of the first through hole;

The air supply chamber is used to provide compressed air and a negative pressure environment for the air storage chamber, which is located below the relaxation chamber; the air supply chamber includes an air supply pipe, a reducing pipe, an air outlet pipe and a compressed air source, and the compressed air is compressed according to the compressed air. The direction of air source, air supply pipe, reducing pipe, and air outlet pipe; among them, the reducing pipe is a reducing pipe with a diameter from large to small according to the flow direction of the compressed air, and the pipe wall on the upper side of the reducing pipe is provided with and storage. The second hole corresponding to the through hole of the air chamber; when the compressed air flows through the first through hole, a negative pressure environment is provided for the air storage chamber, and the release film to be loosened extends downward in the vertical direction.

Preferably, one end of the air supply pipe is connected to the compressed air source, and the other end is connected to the end with a larger diameter of the reducing pipe, and the compressed air enters the reducing pipe from the air supply pipe; one end of the air outlet pipe is located in the reducing pipe On the outflow side of the compressed air of the second orifice, the other end is located outside the reducing pipe, and the air outlet pipe and the axis of the reducing pipe are located at the same horizontal position.

Preferably, one end of the air outlet pipe located in the reducing pipe is connected by a thread provided on the outer wall of the air outlet pipe and the inner wall of the reducing pipe, and the distance between the air outlet pipe and the air supply pipe can be adjusted through the thread.

Preferably, the pressure of the compressed air in the air supply pipe is 1.2-1.8 times the standard atmospheric pressure.

Preferably, the flow rate of the compressed air in the air supply pipe is 0.5-2 L/min.

Preferably, the number of air supply chambers is more than one; the relaxation device further includes a main air supply part, and the main air supply part provides compressed air for all air supply chambers.

Preferably, a soft gasket is placed on a diameter upper end of the first through hole, and the soft gasket is used to support the peeling film to be relaxed.

Preferably, both the main air supply component and the air supply pipeline of the air supply chamber are provided with valves for adjusting the flow rate.

Preferably, the relaxation device further comprises a bearing platform; the relaxation chamber and the air supply chamber are located above the bearing platform; the main air supply component is located below the bearing platform, and provides compressed air to the air supply chamber through a pipeline.

Preferably, a height-adjustable base is provided below the carrying platform.

Preferably, the relaxation chamber is cylindrical, rectangular or other structures.

Preferably, the relaxation device further comprises a drying device

Preferably, the drying device includes a lamp holder and a tungsten lamp on the lamp holder.

Preferably, the release film is a carbon release film or a DLC release film.

Preferably, the release film to be relaxed is fixed on the target frame and placed at the upper end of the first through hole, wherein the size of the first through hole is smaller than the size of the target frame and larger than the size of the release film to be relaxed.

(3) Beneficial effects

The relaxation method provided in this application is adopted, which utilizes compressed air to flow in the air supply chamber so that the release film in the relaxation chamber extends down to 1-3mm in the vertical direction, and the relaxation success rate reaches more than 90%. Membrane life is 3 times higher than before relaxation.

Description of drawings

1 is a schematic diagram of the overall structure of the relaxation device provided by the present invention

2 is a schematic diagram of the main structure of the relaxation device provided by the present invention;

3 is a schematic cross-sectional view of the main structure of the relaxation device provided by the present invention;

1 is the relaxation chamber; 1-1 is the first through hole; 1-2 is the air storage chamber; 1-3 is the soft gasket; 2 is the air supply chamber; 2-1 is the air supply pipe; 2-2 is the variable Diameter pipe; 2-3 is the air outlet; 3 is the bearing platform; 4 is the adjustment seat; 5 is the lamp holder; 6 is the valve.

Detailed ways

The present application will be further described below with reference to specific embodiments and accompanying drawings.

Example

Due to the needs of nuclear physics experiments, more and more high-current and low-energy heavy ion beams are drawn from the accelerator, which puts forward higher requirements for the life of the peeling film. The peeling life of 197Au-ions is 4 to 8 minutes, while the beam time of an experiment of a physical user is usually 100 hours, so it is necessary to constantly replace the peeling film. The number of release films that can be installed at one time in the accelerator is limited, and the short life of the release film directly leads to unsmooth supply of beams for physical experiments, and shortens the repair cycle of the accelerator, thereby reducing the operating efficiency of the accelerator and increasing the operating cost of the accelerator. This embodiment provides a relaxation device and relaxation method that can significantly improve the life of the release film.

A relaxation method, the method is to provide a negative pressure for the release film fixed on the target frame, and extend the release film down to a desired depth (generally 1-3mm) in the vertical direction to relax the release film, Before the release film is relaxed, the surface has a certain humidity, and the fresh release film that has just been bleached is the best. During the relaxation process of the release film, baking is performed while relaxing, so as to improve the relaxation speed and efficiency.

The relaxation method uses a relaxation device, which includes: a relaxation chamber in the shape of a cylinder, a rectangular parallelepiped or other structures for supporting the carbon release film; the relaxation chamber is provided with a first through hole 1-1 penetrating in the vertical direction , the space where the first through hole 1-1 is located is the gas storage chamber 1-2; after the loose carbon peeling film is fixed on the target frame, it is placed on the upper end of the first through hole 1-1, and the upper end of the gas storage chamber is open to the The diameter of the hole is not smaller than the diameter of the carbon peeling film to be relaxed; the target frame is a ring-shaped target frame.

The relaxation device also includes an air supply chamber 2 for providing compressed air and a negative pressure environment for the air storage chamber 1-2, which is located below the relaxation chamber 1; the air supply chamber 2 includes an air supply pipe 2-1, a variable diameter Pipe 2-2, air outlet pipe 2-3 and compressed air source, the compressed air flows in the direction of air supply pipe 2-1, reducing pipe 2-2, and air outlet pipe 2-3; The diameter of the compressed air flow direction varies from large to small, and a second hole corresponding to the through hole of the air storage chamber is provided on the upper pipe wall of the reduced diameter pipe; when the compressed air flows through the first through hole 1-1 , to provide a negative pressure environment for the gas storage chamber, and the carbon release film to be relaxed extends downward in the vertical direction.

One end of the air supply pipe 2-1 is sealed with the compressed air source, and the other end is sealed with the larger diameter end of the reducing pipe 2-2. The compressed air enters the reducing pipe 2-2 from the air supply pipe 2-1. ; One end of the air outlet pipe 2-3 is located at the compressed air outflow side of the second hole in the reducing pipe 2-2, and is connected by the thread provided on the outer wall of the air outlet pipe 2-3 and the inner wall of the reducing pipe 2-2, through the thread The distance between the air outlet pipe and the air supply pipe can be adjusted. The other end of the outlet pipe 2-3 is located outside the reducing pipe 2-2, and the axis of the outlet pipe 2-3 and the end with the smaller diameter of the reducing pipe 2-2 are located at the same horizontal position.

The pressure of the compressed air in the air supply pipe 2-3 is 1.2 times the standard atmospheric pressure. The flow rate of the compressed air in the air supply pipe 2-3 is 0.5L/min.

The number of the air supply chambers 2 is 16; the relaxation device also includes a main air supply part, which provides compressed air for all air supply chambers.

A soft gasket 1-3 is placed on the upper end of the first through hole 1-1, and the soft gasket is used to support the peeling film to be loosened.

The main air supply component and the air supply pipeline of the air supply chamber are provided with a valve 6 for adjusting the flow rate.

The relaxation device provided by another embodiment of the present invention further includes a bearing platform 3; the relaxation chamber 1 and the air supply chamber 2 are located above the bearing platform 3, and the number of air supply chambers is 8; The pipeline supplies compressed air to the air supply chamber 2 . A height-adjustable adjusting seat 4 is arranged below the bearing platform 3 . The loose release film is the DLC release film fixed on the target frame. The pressure of the compressed air in the air supply pipe 2-3 is 1.5 times the standard atmospheric pressure. The flow rate of the compressed air in the air supply pipe 2-3 is 1 L/min.

The present invention also provides an embodiment, the relaxation device further includes a drying device, and the drying device includes a lamp holder and a tungsten lamp located on the lamp holder. The pressure of the compressed air in the air supply pipe 2-3 is 1.8 times the standard atmospheric pressure. The flow rate of the compressed air in the air supply pipe 2-3 is 2L/min. The release film to be relaxed is a DLC film.

With the relaxation method, the release film is relaxed by supplying a negative pressure to the release film by the flow of compressed air in the air supply chamber, and extending the release film downward in the vertical direction to a desired depth. The peeling film is fixed on the target frame, and the surface of the peeling film has a certain humidity before relaxation. The downward relaxation depth of the release film is 1-3 mm. During the relaxation process of the release film, baking is performed while relaxing, so as to improve the relaxation speed and efficiency.

After relaxation by this relaxation method, the life of the release film used in the accelerator can be increased by 3 times.

Claims (13)

1. A relaxation method, characterized in that, by supplying a negative pressure to the release film, the release film is extended downward to a desired depth in a vertical direction to relax the release film. 2 . The relaxation method according to claim 1 , wherein the release film is fixed on the target frame, and the surface of the release film is kept wet before relaxation. 3 . 3 . The relaxation method according to claim 1 , wherein the downward relaxation depth of the release film is 1-3 mm. 4 . 4 . The relaxation method according to claim 1 , wherein the release film is baked while being relaxed during the relaxation process. 5 . 5. The relaxation method of claim 1, wherein the relaxation method is implemented using a relaxation device, wherein the relaxation device comprises: The relaxation chamber is used to support the release film; the relaxation chamber is provided with a first through hole penetrating in the vertical direction, and the space where the first through hole is located is an air storage chamber; the release film is placed on the upper end of the first through hole; The air supply chamber is used to provide compressed air and a negative pressure environment for the air storage chamber, which is located below the relaxation chamber; the air supply chamber includes an air supply pipe, a reducing pipe, an air outlet pipe and a compressed air source, and the compressed air is compressed according to the compressed air. The direction of air source, air supply pipe, reducing pipe, and air outlet pipe; among them, the reducing pipe is a reducing pipe with a diameter from large to small according to the flow direction of the compressed air, and the pipe wall on the upper side of the reducing pipe is provided with and storage. The second hole corresponding to the through hole of the air chamber; when the compressed air flows through the first through hole, a negative pressure environment is provided for the air storage chamber, and the peeling film extends downward in the vertical direction. 6. The relaxation method according to claim 5, wherein one end of the air supply pipe is connected to the compressed air source, and the other end is connected to the end with a larger diameter of the reducing pipe, and the compressed air enters the variable diameter pipe from the air supply pipe. Diameter pipe; one end of the air outlet pipe is located on the compressed air outflow side of the second hole in the reducing pipe, and the other end is located outside the reducing pipe, and the axis of the air outlet pipe and the reducing pipe are located at the same horizontal position. 7. The relaxation method according to claim 5 or 6, characterized in that, one end of the air outlet pipe located in the reducing pipe is connected by a thread provided on the outer wall of the air outlet pipe and the inner wall of the reducing pipe, and the air outlet pipe can be adjusted by the thread distance from the air supply pipe. 8 . The relaxation method according to claim 5 , wherein the pressure of the compressed air in the air supply pipe is 1.2 to 1.8 times the standard atmospheric pressure. 9 . 9 . The relaxation method according to claim 5 , wherein the flow rate of the compressed air in the air supply pipe is 0.5-2 L/min. 10 . 10 . The relaxation method according to claim 5 , wherein the number of air supply chambers is more than one; the relaxation device further comprises a main air supply part, and the main air supply part provides compressed air for all air supply chambers. 11 . 11 . The relaxation method according to claim 5 , wherein a soft gasket is placed on a diameter upper end of the first through hole, and the soft gasket is used to support the release film. 12 . 12. The relaxation method according to claim 5, wherein the relaxation device further comprises a drying device. 13 . The relaxation method according to claim 5 , wherein the release film is fixed on the target frame and placed at the upper end of the first through hole, wherein the size of the first through hole is smaller than the size of the target frame and larger than the size of the release film. 14 .

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